# OpenCPN

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Open source maritime plotter

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OpenCPN Developer The OpenCPN Authors Stable release 5.12.2 [1] / August 2, 2025 (2025-08-02) Written in C, C++ Operating system Cross-platform Type Chart plotter and navigation License GPL v2[2] Website opencpn.org Repository github.com/OpenCPN/OpenCPN

**OpenCPN** (**Open** **C**hart **P**lotter **N**avigator) is a [free software](/source/Free_software) [maritime](/source/Maritime_transport) chart plotter and navigation software for use underway or as a planning tool. Developed by a team of active sailors and tested in real world conditions, it has multiple supported chart formats and a variety of data inputs.[3][4]

By using [satellite navigation](/source/Satellite_navigation) and other [NMEA 0183](/source/NMEA_0183) data feeds, OpenCPN determines a ship's own position and status from sensors such as [AIS](/source/Automatic_Identification_System) receivers to automatically plot and track the positions of ships in the neighborhood.[5]

In 2017 Norwegian [ENC](/source/Electronic_navigational_chart) charts were available for OpenCPN.[6]

## References

1. **[^](#cite_ref-1)** ["OpenCPN Download Directory"](https://opencpn.org/OpenCPN/info/downloadopencpn.html). *opencpn.org*.

1. **[^](#cite_ref-2)** ["OpenCPN/OpenCPN"](https://github.com/OpenCPN/OpenCPN/blob/master/data/license.txt). *GitHub*.

1. **[^](#cite_ref-3)** ["OpenCPN About"](https://opencpn.org/OpenCPN/info/about.html). Retrieved 22 April 2018.

1. **[^](#cite_ref-4)** Monthly, Yachting (2022-02-01). ["Free digital nautical charts: are they any good?"](https://www.yachtingmonthly.com/gear/free-digital-nautical-charts-are-they-any-good-83659). *Yachting Monthly*. Retrieved 2022-09-13.

1. **[^](#cite_ref-5)** A, Damián (2020-07-22). ["OpenCPN, a navigation application for Ubuntu"](https://ubunlog.com/en/opencpn-free-navigation-application/). *Ubunlog*. Retrieved 2022-09-13.

1. **[^](#cite_ref-6)** ["Norwegian ENC Data in OpenCPN"](https://www.hydro-international.com/content/news/norwegian-enc-data-in-opencpn). 2017-09-11.

Wikimedia Commons has media related to [OpenCPN](https://commons.wikimedia.org/wiki/Category:OpenCPN).

## See also

- [Free and open-source software portal](https://en.wikipedia.org/wiki/Portal:Free_and_open-source_software)

- [OpenSeaMap](/source/OpenSeaMap)

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Adapted from the Wikipedia article [OpenCPN](https://en.wikipedia.org/wiki/OpenCPN) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/OpenCPN?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.